X u uhited



w. F. SHAW.

Lamp.

Patented Dec- 31. 1842.

with the accompanying 'srarss iPAYTENQT carton.

WM. FJsHAw, or BOSTON, MASSACHUSETTS.

' LAMP.

Specification of Letters Patent No 2,893, dated December 31, 18 42.

. by which it may be distinguished from others of like character, together with such parts thereof as I claim and consider new.

Figure 1, of the drawings above referred to, exhibits an outside view or side elevation of my improved apparatus to be applied to a cylindrical Argand or astral burner. Fig. 2, is a side view of a burner. Fig. 3, is a vertical and central section of an astral lamp, arranged according to my improved method. Fig. 4, is a vertical and central section of the movable tube, which encompasses the exterior tube of the burner, the said section being taken in a plane at right angles to that on which Fig. 3, is delineated.

A Fig. 1, and A A, Fig. 3, represent an ordinary solar cone or apparatus mounted upon the top of a cylindrical tube B, Figs. 1, 4, and B B Fig. 3, which tube on a removal of the chimney shelf and apparatus which usually operates the wick tubes and wick, is to be placed over and surround the outer tube C C Fig. 3, and C Fig. 2, of the tubular burner as seen in the section Fig. 3. The internal diameter of the tube B should be equal to or a very little greater than the external diameter of the outer tube C of the burner, or in other words should fit closely thereon and still admit of being turned around laterally upon the same, for the purpose of elevating or depressing the wick,

' which is accomplished by a notch D Fig. 4,

formed or cut out of an internal ring or ,-.,shoulder E E, projecting from the interior circumference of the tube B at its top. When the tube B is passed over or slid upon the burner, the shoulder or ring E E rests upon the top of the outer tube C C thereof, and at the same time the notch D receives the pin F, which generally projects from the tube G G Fig. 3 and G Fig. 2, surrounding the wick H H and by the lateral revolutions of which, the wick is caused to ascend or descend.

The inner tube I and other parts of the burner and lamp are arranged in the usual manner.

The solar cone A is attached to the top of the tube B by a series of arms a, a, a, between which the current of air which rushes through the cone passes, as denoted by the arrows in Fig. 3, the spaces between these arms constituting so many air ducts for this purpose. The lower ,part' of the solar cone generally extends outward, or beyond the arms as seen. at b, 6, Figs. 1, 3. At a very short distance belowthe lowest part b b of the solar cone, a circular plate K K is attached to the tube B B Figs. 1, 3, so as to extend around the same as seen in the drawings. The object of this plate is to cause the air, which passes into the cone, to do so in a thin sheet through the opening between the plates Z) I) and K K asdenoted by the arrows in Fig. 3, and alsoto protect the said current of air from lateral atmospheric cur-- rents which would otherwise create a flickering of the flame or unequal action ofthe outer current thereon. By the above arrangement of the solar apparatus upon a movable tube, which may be placed over the burner of an ordinary astral lamp, whenever it may be desirable to burn the lamp on the solar plan, it will be readily understood how easily this can be effected, and without any alteration or change of the lamp fountain or oil reservoir L Fig. 3.

Having thus explained my invention, I

the cone plate in order that- 'the current of air, which is supplied to the outside of the flame may be introduced into the solar cone in athin sheet and be protected bysaid 2. Also. The combination with the-cone or cone plate I) b of a circular plate K- K 7 applied to the tube B a short distance below.

plate from the action of other atmospheric provements I have heretoset my signature currents, which would'be likely to affect the this third day of December, in the year proper operation of the said external cureighteen hundred and forty-two.

rent upon the flame, the Whole being as W. F. SHAW. 5 hereinabove described. Witnesses: 7 V

In testimony that the foregoing is a true R. H. EDDY, 1

description of my said invention and im- E. LINCOLN, Jr; 

